1. Life and Health Sciences Research Institute, School of Health Sciences, University of Minho
2. Department of Urology, Santo António General Hospital, Porto, Portugal
3. Department of Gastroenterology, Sao Marcos Hospital, Braga
4. Department of Gastroenterology, Anesthesiology, Sao Marcos Hospital, Braga
5. Department of Pediatric Surgery, Sao Joao Hospital, Porto, Portugal